The ongoing feud between sisters Mary and Liz Cheney continued on Facebook Sunday, when Mary Cheney wrote that her sister’s stance against gay marriage is “just wrong” and stands “on the wrong side of history.”

Currently running for Senate in Wyoming, Liz Cheney has taken a position against gay marriage.

Poe said it hurt her feelings to see Liz on national television over the weekend speaking out against marriage equality.

“I was watching my sister-in-law on Fox News Sunday (yes Liz, in fifteen states and the District of Columbia you are my sister-in-law) and was very disappointed to hear her say ‘I do believe in the traditional definition of marriage,’” Poe wrote.

“Liz — this isn’t just an issue on which we disagree — you’re just wrong — and on the wrong side of history,” Mary Cheney wrote on her page.

She received comments both for and against her views.

“I support you Mary,” one man wrote. “When the divorce rate is so high among heterosexuals, with children paying the highest price, I can’t understand the fundamentalist opposition to gay marriage. It is hypocritical.”

One commenter suggested that Cheney be “lovingly tolerant” of her sister’s views against same-sex marriage.

“Sorry, Mary,” a commenter wrote. “I’m with Liz on this one. Can’t you all just accept Liz’s position and remain lovingly tolerant? She has her opinion, you have yours.”

“This isn’t like a disagreement over grazing fees or what to do about Iran,” Mary Cheney responded. “There isn’t a lot of gray here. Either you think all families should be treated equally or you don’t. Liz’s position is to treat my family as second class citizens. That’s not a position I can be ‘lovingly tolerant’ towards.”

Former Vice President Dick Cheney came out in support of gay marriage in 2004.

Cheney said Monday that he and his wife Lynne are “pained” to see their daughters publicly battle it out over gay marriage. They stated that Liz “has always treated her sister and her sister’s family with love and respect, exactly as she should have done.”

“I don’t believe we ought to discriminate against people because of their sexual orientation,” Liz Cheney told Fox News’ Chris Wallace on Sunday. “If people are in a same sex relationship and they want their partner to be able to have health benefits or be designated as a beneficiary in their life insurance, there’s no reason we shouldn’t do that. I also don’t support amending the Constitution on this issue.”